civil rights groups pushing back against voter i.d. laws enacted by republican controlled legislatures since 2010. >> the effort to change the rules of the game at the last minute is a really misguided effort. >> reporter: wendy wiser is with the brandon center for justice and warns hundreds of thousands of voters may not have necessary i.d. they include the elderly, college students, poor people, blacks and latinos, groups that traditionally vote democratic. >> we need to do everything we can to ensure that there is no fraud in our elections, but what we shouldn't be doing is passing unnecessary laws that needlessly exclude thousands or hundreds of thousands of eligible americans from participating equally in our democracy. >> reporter: the new voter i.d. laws protect only against voter impersonation. in pennsylvania, a traditional swing state, lawyers for both sides admit no known cases of in person fraud. still, it is a problem says conservative columnist john fund, an expert on the subject. >> if someone walks in and votes in the n